This article integrates theory and concepts from the business and society, business ethics, and labor relations literatures to offer a conceptualization of labor union social responsibility that includes activities geared toward three primary objectives: economic equity, workplace democracy, and social justice. Economic, workplace, and social labor union stakeholders are identified, likely issues are highlighted, and the implications of labor union social responsibility for labor union strategy are discussed. It is noted that, given the breadth of labor unions in a global work environment, labor union social responsibility also has implications for NGOs, corporations, and how corporate social responsibility is viewed going forward. This article concludes by noting that the nexus of labor relations and corporate social responsibility warrants more attention in management and labor relations literatures